TEM Asbestos air sample results, NYC BOE, Apr 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1840 Lab Group #: 7444 Filter Type / Filter .4rea: MCE 385 mm- Lab Sample #: 10 Grid Opening Size: 0.01124 Client Sample #: 10 Area Examined: 0.04496 rnm- GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 4/17/02

Analysis Performed By: ROMAN PEYSAKHOV

GO. Structure Structure Type Length 10 of Structure N or V EDS t No (Nonadb F B C M >=05 u Chrys Amphibole Nonasb Ambig/ND Elements) ' No Coord <5u

4(i (/

2^

Struct == > 0.5u > 5:1 Aspect Ratio Grid acceptance: Positive diffraction pattern properties conforming to <50% undissolved filtei, overlapped or folded Totals laboratory identification criteria observed <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% F I B I C ) M i >cq v'= ECS spectrum conforminc to laboratory holes or opaque areas identification criteria observed Chrysotile —i----------------- AMPHIBOLES Amphibole j F = Single Fiber Amosite B = Bunole (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous ' C = Cluster '>3 Intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix Non-ldentified ) Actinolite NSO = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003471113 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176954